The basic unit of matter is ______.

(a)

Element

(b)

Atom

(c)

Molecule

(d)

Electron

_______ is positively charged.

(a)

Proton

(b)

Electron

(c)

Molecule

(d)

Neutron

The atomic number of an atom is the ______.

(a)

Number of neutrons

(b)

Number of protons

(c)

Total number of protons and neutrons

(d)

Number of atoms

The smaller particles found in the atom are called _______.

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Subatomic particles

The _______ revolve around the nucleus.

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electrons

There are two electrons in the outermost orbit of the magnesium atom. Hence, the valency of magnesium is_______.

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2

Neutral Particle

(1)

Neutron

Iron

(2)

Proton

Hydrogen

(3)

Monovalent

Positively charged Particle

(4)

Fe

Define - Atom.

What is atomic number?

Why neutrons called neutral particles?

Distinguish Isotopes from Isobar.

Differentiate mass number from atomic number.

An atom of an element has no electron, will that atom have any mass or not? Can an atom exist without electron? If so then give example.

Draw the structure of an atom and explain the position of the sub-atomic particles.